COVID-19 vaccination associated with a small, temporary increase in menstrual cycle length, study suggests
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6 January 2022COVID-19 vaccination associated with a small, temporary increase in menstrual cycle length, study suggests
Women receiving one dose of a COVID-19 vaccine during a single menstrual cycle had an increase in cycle length of nearly one day, compared to unvaccinated women, according to a study funded by the National Institutes of Health. The increase in cycle length—a longer time between bleeding—was not associated with any change in the number of days of menses (days of bleeding). The study appears in Obstetrics & Gynecology.
